The 30-share BSE Sensex benchmark, after scaling a high of 34,278.63 in early deals, slipped into the negative zone to touch 34,015.79, before settling at 34,046.94, down 137.10 points, or 0.40 per cent. The 50-issue NSE Nifty too lost 34.50 points, or 0.33 at 10,458.35 after shuttling between 10,525.50 and 10,447.15.